I see, you should have given that detail and said it was from Aurora.
If you’re running Aurora, it should be simple for you to know what pattern you are running, if you can’t figure out it, look at serial output and/or add printfs.

Sorry, I haven’t run Aurora in years, so I don’t know. You can try posting to FastLED as suggested, as there’s a big chance someone there (including Jason Coon the author) will read your message and know the pattern

Unfortunately, I have no way to run the entire code, and the count of patterns is large enough to adapt each for my ESP 8266 and to check. And I’m not at all sure that this pattern is in this version of the source code.

i suspect I failed to use fabs because I had no idea it existed or that abs was going to be an issue. So, I learned something today.

The code seems to function despite this or does it? Anyway, with the exception of taking an introduction class 15-111 at Carnegie Mellon, I am a self taught programmer who has a tiny bag of tricks but uses them often.